soc/amd: use common ACPI_SCI_IRQ definition

ACPI_SCI_IRQ is defined as 9 for all AMD SoCs, so move the definition to
the common amdblocks/acpi.h. Since all but Stoneyridge's soc/acpi.h are
now empty, delete those files too.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I8210c98dc4cf2c6001d5273d132053278ff7fea5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80222
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/phoenix/acpi.c

@@ -16,7 +16,6 @@
 #include <arch/smp/mpspec.h>
 #include <console/console.h>
 #include <cpu/amd/cpuid.h>
-#include <soc/acpi.h>
 #include <soc/iomap.h>
 #include <types.h>
 #include "chip.h"